--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/crypto/weakcrypto/source/asymmetric/rsadecryptor.cpp Fri Jun 11 15:32:35 2010 +0300
@@ -0,0 +1,98 @@
+/*
+* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*/
+
+
+#include <asymmetric.h>
+#include <asymmetrickeys.h>
+#include <bigint.h>
+#include <cryptostrength.h>
+#include <securityerr.h>
+#include <cryptopanic.h>
+#include "rsafunction.h"
+
+/* CRSAPKCS1v15Decryptor */
+
+EXPORT_C CRSAPKCS1v15Decryptor* CRSAPKCS1v15Decryptor::NewL(
+ const CRSAPrivateKey& aKey)
+ {
+ CRSAPKCS1v15Decryptor* self = NewLC(aKey);
+ CleanupStack::Pop(self);
+ return self;
+ }
+
+EXPORT_C CRSAPKCS1v15Decryptor* CRSAPKCS1v15Decryptor::NewLC(
+ const CRSAPrivateKey& aKey)
+ {
+ CRSAPKCS1v15Decryptor* self = new(ELeave) CRSAPKCS1v15Decryptor(aKey);
+ CleanupStack::PushL(self);
+ self->ConstructL();
+ return self;
+ }
+
+TInt CRSAPKCS1v15Decryptor::MaxInputLength(void) const
+ {
+ return iPrivateKey.N().ByteCount();
+ }
+
+TInt CRSAPKCS1v15Decryptor::MaxOutputLength(void) const
+ {
+ return MaxInputLength() - iPadding->MinPaddingLength();
+ }
+
+void CRSAPKCS1v15Decryptor::DecryptL(const TDesC8& aInput,
+ TDes8& aOutput)const
+ {
+ __ASSERT_DEBUG(aOutput.MaxLength() >= MaxOutputLength(), User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
+ __ASSERT_DEBUG(aInput.Length() <= MaxInputLength(), User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge));
+
+ RInteger input = RInteger::NewL(aInput);
+ CleanupStack::PushL(input);
+
+ RInteger output;
+
+ RSAFunction::DecryptL(iPrivateKey, input, output);
+ CleanupStack::PushL(output);
+
+ TPtrC8 ptr = *(output.BufferLC());
+ iPadding->UnPadL(ptr, aOutput);
+
+ CleanupStack::PopAndDestroy(3, &input); //BufferLC(), output, input
+ }
+
+CRSAPKCS1v15Decryptor::CRSAPKCS1v15Decryptor(const CRSAPrivateKey& aKey)
+ : iPrivateKey(aKey)
+ {
+ }
+
+void CRSAPKCS1v15Decryptor::ConstructL(void)
+ {
+ iPadding = CPaddingPKCS1Encryption::NewL(MaxInputLength());
+
+ // Check if MaxInputLength() makes sense, if not the key length must
+ // be too small
+ if(MaxOutputLength() <= 0)
+ {
+ User::Leave(KErrKeySize);
+ }
+
+ TCrypto::IsAsymmetricWeakEnoughL(iPrivateKey.N().BitCount());
+ }
+
+CRSAPKCS1v15Decryptor::~CRSAPKCS1v15Decryptor(void)
+ {
+ delete iPadding;
+ }